New vehicles can go 3000 — 7500 miles (4800 — 12 000 km) between oil changes. Older vehicles should have oil changed more, often. Refer to a manual for exact valves.
An older, worn engine will contaminate the oil more quickly than a new engine. More — combustion byproducts will blow past the rings and enter the oil. Also engine-bearing clearance will he larger, requiring more of the oil and lubrication system.
Also, if a car is only drivers for short period and then parked, its oil should be changed more often. Since the engine may not be reaching lull operating temperature, the oil can he contaminated with fuel, moisture, and other substances more quickly.
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